HELP PLEASE

Hi i am 33 weeks pregnant with my #2 in my last week ultrasound they said my baby is 2 weeks behind in weight and my amniotic fluid is on border line if its more less may be i need to go for pre mature delivery.i am so nervous my next appt with my dr. is coming wednesday time is so tuff is anyone else have same satuation or suggestions help please.also have period pain in my lower back and down belly some times